Chain-severing device for sewing-machines.



D-"S. SEYMOUR. CHAIN SEVBBQING DEVICE FOB. SEWING MACHINES.

LPPLIGATION'FILED n.2, 1906.

1,1 14,542. .Patnted Oct. 20, 1914.

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1). S. SEYMOUR. CHAIN SEVERING DEVICE FOR SEWING MACHINES.

APPLIUATION FILED JAN. $1906.

6 SHEETS-SHEET 2.

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Patented Oct. 20, 1914.

D. S. SEYMOUR. CHAIN SEVERING DEVICE FOR SEWING MACHINB$.

APPLICATION I'ILEDJAN.2.190G.

Patented Oct. 20. 1914.

6 SHEETS-*SHEET 3.

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D. S. SEYMOUR. CHAIN SEVERING DEVICE FOR SEWING MACHINES. APPLICATION FILED JAN.2.1006. 1,1 14542. Patented Oct. 20, 1914.

6 SHEETS-SHEET 4.

'ffiilvzam" fizvmior D. $.3SEYM0UR. 0mm snvnnme DEVICE FOR SEWING MACHINES.

APPLICATION II'I-ED 'JAN. 2, 1906.

6 SHEETS-SHEET 5.

Patented Oct. 20, 1914.-

I I O D. s. SEYMOUR. CHAIN SBVERING DEVICE FOR SEWING MACHINES. APPLICATION FILED JAR. 2,1906.

1,1 14,542. Patented Oct, 20, 1914,

8 SHEETS-SHEET 8- sew ng of a number of articles that are fed STATE-S PATENT OFFICE.

DUDLEY S. SEYMOUR, OF OAK PARK, ILLINOIS, ASSIGNOR TO UNION SPECIAL MACHINE COMPANY, OF CHICAGO, ILLINOIS, AYCORIPORIATION OF ILLINOIS.

Specification of Letters Patent.

Application area Januar 2, 1906. Serial no. 294,257.

' This invention relates to sewing machines,

of that class employed in the manufacture of bags or other articles, where a contihuously operating machine is e'niployed in the of stitching; and more especially to ma chines of that class employed for the sewing of filled bags.

" The principal object of the invention is to provide a machine of this type with imea'nsf for automatically'severing the chain operation.

of stitching at points between the successive bags or other articles, and to provide a mechanism whereby the action of the chain 'severin device will be revented so ion as D p as soon as the bag or other article passes from beneath the presser foot or other por tion of the machine, so that the severing device is allowed to operate and cut the chain immediately after the sewing of each bag is completed.

A still further obect of the invention is to provide a novel form of resetting means whereby the severing device is restored to its initial position immediately 'after'each \Vith these and other objects in view, the invention consists in the novel construction and arrangement of parts hereinafter described, illustrated in the accompanying drawings, and particularly pointed out in the claims.

In the drawings: Figure 1 is a perspective-view of a portion of a bag sewin machine provided with a chain severing evicenormal position; Fig. 6 is a constructed and arranged in accordance with the invention; Fig. 2' is a side elevation of the head of the machine; Fig. 3 is an inverted lan view of the head of the machine; Fig. 4- 1s a similar view showing the position of the parts immediately after the descent of the cutting memberzfFig. 5 is a sectional plan view of the machine on the line 5-5 of Fig. 2, showing the parts in etail sectional view ofa portion of the mechanism shown in F 1g. 5, showing the position to which the fabric cont-rolled member moves after the passage of an'alrticle beyond the stitch--' mg mechanism; F ig. 7 is a detail perspective view of the auxiliary frame on which a portion of theseveringmechanism is carried; Fig. 8 is a detail view ofthe fabric engaging disk and its suppor ng bar; Fig. 9 is a simila'r view of the seve ing device and its carrying bar; Fig. 10 is-a plan view of.the trip actuating lever, the trip and the devices for connecting and supporting the same; and Fig. 11 is a detail perspective view ofthe rear portion of the cloth plate. Fig. 12 is a face view of the cloth plate, showing the feed dog.

' The working parts of the machine are sup ported on a suitable frame work 10, that is. provided as usual with a movable support 11, in the. form of an endless belt, on which the speed of operation of the machine.

The sewing head 12 is of the usual type and is provided with a casing 13 at the lower end of which is a cloth plate 14, and within this casing is arranged the usual looper and its operating shaft, together with the feed dogs 15, the latter being arranged and operating in the manner hereinafter described.

At the head of the machine are guides for the reception of the needle bar 16 and presser bar 17, the latter'carrying a presser foot 18 tl it is pivoted at the lower end of the presser bar and is provided with a forward curved end to follow the contour of the curved portion of the feed dog, and a horizontal rear end corresponding to the similar portion of the dog. The presser foot is depressed in the usual manner by a spring 19.

The forward end of the feed dogis divided into three sections and the outer sec- Patented Oct. 20, 1914..

tions are continued rearward in parallel relation, while the intermediate section terminates at the rear end of the curved portion of the cloth plate andpresser foot, this intermediate section being further divided into sections that are arranged respectivel in advance and to the rear of the needle be e of the cloth platel In the horizontal portion of the cloth plate, at a point to the rear of the central portion of the feed dog, is a dovetail slot 21 that is arranged to receive a similar-ly shaped bar 22 forming an anvil, which coa'cts with a movable cutter member in severing the chain, there being no direct shear cut of the chain, but rather a mutilation of the chain to such an extent as to sever the same. Between this anvil bar 22 and the inner side of the cloth plate is arranged a recess 24 over which the cloth passes, the cloth bridging the-recess and serving at this point to support a'presser disk 26, which is held down against the fabric by a suitable spring and rides on the fabric so long as the stitching of the fabric continues, but when the sewing of a bag or other article is com leted and said article' passesbeyond the dis t, the latter will move down and in so doing will trip the cutter member which will then descend against the chain, the cutter member striking a ainst the anvil with suiiicient force to eitect the severing operation, or if necessary, the anvil maybe provided with a cuttin" edge so that in connection with the movalile cutter, the shearing of the chain may be accomplished.

Projecting rom the head of the machine is a pair of lugs that form aides for a cutter bar 31. At t e lower en of the cutter bar 31 is a cutter block 32 formed of hardened steeland provided with a cutting or rather bruising edge 33, which engages with the chain passing over the anvil each time the cutter bar is allowed to descend.

Near the upper end of the cutter bar is an adjustable block 34 that is provided with an elongated'slot 85 for the passage of a securscrew 36, so that the block may be first in uiiusted and then locked to the cutter bar in any desired position. From this block or from the cutter bar proper projects a. pin or hook 87, to which is connected one end of a helical tension spring 38 the lower end of which is secured to one of the guide lugs 30, or other portion of the fixed frame. This constitutes the *im elling rin by which the cutterbarv is driven forcibly in the direction of the anvil for the pur o'se of sever-ing the chain.- From the outer ace of the b.'cck 34 extends a cam 39, the function of which will hereinafter appear. An intermediate po'rtio'iiof the cutter bar is flattened to form a'guide foran arm 40, that'projects'trom the Presser bar and serves to preventfrotative inove'mentlot the latter; "I

Sccu're'd'to the upper portion of the head pin.

is a frame 13 that carries at its rear end a stud 44 free to rotate within an opening formed in said frame, and secured to the stud is a bracket 45, that is provided with two projecting lugs and 47, these having openings for the reception of a longitudinally movable trip operating bar 48. The bar is provided with a transversely extending pin 49 between which and the lug 4G is arranged a contractile spring :30, tending normally to move the bar in the direction of the presser foot. The lower end of this lltll is provided with a stud 51 on which is mounted the disk 26 previously described, the disk riding on the "fabric during the stitching operation. The upper lug 4 t) of frame 15 is provided with a projecting arm 52 having a cam shaped end arranged to engage with the cam .49, when the latter has been moved by the cutter bar, and when these cams are in contact with each other, the trip operating bar 48 is adjusted to inoperative position. Extending from the ing 46 is a spring 55 that tends to move the bracket 4:": in the direction of the head of the machine and to keep the cam 52 in engagement with the cam 89.

In the upper portion of the frame 43 is arranged a stud 57 on which is mounted a small trip lever 58, the it )per end of which is arranged to engage under a lng59 at the up )er portion of the cutter bar 31, and thus hoid said cutter bar in elevated position against the resistance otiered by the spring 38. The hub portion of the tri lever 58 is provided with a lug 60, to whic 1 one end of the spring 56 is attached, the spring performing two functions, one, to draw the bracket 45 in the directior of the head of the machine, and the other to maintain the upper end of the trip in position to engage a luo' Fit). The rear end of the trip lever is provided with a lug 62 that projects under a trip actuating lever 63, that also is pivoted on the stud 57 and a free end of this lever (33 extends into a slot (34 that. is formed in a head block 65 on the end of the trip actuating bar 48. Extendin across the slot, (it is a pin 66, with which the col of the lever 63 engages and said lever has a projecting toe 7 that remains at all times under the Above the base of the toe in, the end of the lever is )rovided with a slot (18 of a width greater titan the diameter of the pin 66 and in which said )in plays under noriniil conditions, the pin being held within the recess-by means of the spring and the width of the recess is such as to allow a limited amount of longitudinal play of the bar 48 without permittin the pin to come into working contact witi the wall of the recess. Secured to the lower face of the lover 3 iaa leaf sprin 70, the. free end of which extends into the slot (H- bearing against the lower-wall of the slot and tend- '7 ing normally to elevate the free end of said lever 63. In connection with this portion of the mechanism, it ma be here noted that when the cutter bloc moves against the anvil, cam 39 will engage the cam 52 and the frame 45 will be forced outward from the head of the machine, the pin 66 being then moved out of the recess 68 to allow the lever 63 to move outward under the action of the spring 70 until the pin 66 rests against ithe toe 67 of the lever 63. The object of this movement of the lever 63 is to allow greater freedom of movement of the bar 48, and the disk 26, without transmission of movement to the trip operating lever 63 and to enable the detent 58 to move back to the position where it may engage the member 59 to hold the cutter in its proper position. \Vhen the cutter bar is ralsed and the cam 39 moves out of engagement with the cam 52, the trip.mechanism can be re-set by placing the fabric beneath the roller 26. By this means the spring 50 is compressed, and the bar 48 given a longitudinal movement, and, since the upward movement of the lever 63 under the action of its spring 70 is limited by a finger 74 that is secured to the frame, and projects over the top of the said lever at a point near its center of movement, this movement of the bar 48 moves the pin 66 out of the recess at, the bottom of the toe 67 and allows the spring 5 to swing the frame so as to bring the pin 66 into the recess 68.

In the rear face of the cutter bar is pivoted a latch 75, the nose of which is arranged to project beyond one face of the cutter bar and the latch is provided with a projecting lug 76, which when the cutter bar moves upward engages a-stop 77-, adjustably' secured to the fixed head and moves the nose of the latch inward so that it will no longer project from the side of the cutter bar, the extent of inward movement being limited byvan adjustable stop 78 secured to the cutter bar. W'hen the cutter bar moves down, this lug 76 moves against the free end of a small leaf spring 79, that is arranged within the recess 80 in the fixed head, and the latch is then shifted so that its noseprojects .beyond the edge of the cutter bar.

Pivoted to the head of the machine is a lever 80 the lower end of which IS arranged to engage with the latch and to move the cutter bar to initial position against the stress of the spring 38. The upper end of this lever is connected by a pitman 81 to a crank pin 82 on a crank disk 83 that is carried by a shaft 84 adapted to suitable bearings in a bracket85. The bracket 85 is secured to the main frame of the machine and carries a grooved belt wheel 86 against which one of the operating belts bears, so that the wheel will be rotatedconstantly and the movement will be transmitted to the lever-=, so that the latter will be continu- 'ously vibrated. The iconstruction therefore -moves the cutter bar to such position that the trip 58 is in engagement with the lug 5 9, the lug 76of the latch has engaged a stop 77 and the nose of the latch is withdrawn from the'path of movement of the lever 80, so that the latter will play idly to and fro without positively engaging the latch. As soon, however, as the cutter bar is allowed to descend the latch is moved downward and on the next operation of the lever the cutter bar is restored to its initial position in readiness for another operation.

The operation of the cutter, in brief, is as follows: So long as any fabric remains under the wheel 26 and bridges the recess of the cloth plate, the trip actuating bar 48 will be held out and the pin 66 will play idly in the recess 68 to an extent depending on minute variations in the thickness of the cloth. During this time, the trip 58 will be in engagement with thelug 59 and the cutter bar will be held elevated with the spring 38 under stress. As soon as the fabric passes beyond the disk 26, the latter descends and in descending carries with it the pin 66, which latter engages the lower wall of the recess 68 draws down the free end of the lever 63 and the latter, engaging against the lug 62 pulls on the trip 58 and moves said trip from engagement with the lug 59. The cutter bar is then forced downward by the spring 38 with'sufiicient force to sever the chain or to bruise the latter to such extent as to permit of ready separation of the piece of fabric from the next piece being operated upon.

It is to be understood that while the illustration in the present case is confined-t0 the filled bag machine, the invention is ap 1icable to sewing machines of any type, of escription, where it is desired to operate the machine continuously in the stitching of a number of successive articles, which as they successively pass beyond the disk 26, will trip the cutter bar and permit the cutter to operate.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent, is

1. In mechanism of the class described, the combination with a sliding severing knife, shiftable from set position to perform its out, of means acting to move it from its set position, means for holding said knife inits set position against the action of the moving means, and a trip operating on the holding means to release said knife and to permit it to be shifted by the moving means, said trip being held normally inoperative by the article to be severed, but operating when the article has passed.

2. In mechanism or the character described, the combination with sliding severing mechanism movable from a set position to perform its cut, of a spring acting to draw the severing mechanism from its set position, means for holding the severing mechanism in its set position against the action of the spring, and a trip for acting upon the holding means to release the severing mechanism and permit its movement by theisprin said trip being normally held inoperative by the article to be severed, but operating when the article has passed.

3. In mechanism of the class described, the combination with a reciprocatory blade having a cutting edge and mounted to move to and from set position, of means for holding the blade in its set position, means for automatically returning the blade to its set position after a cutting stroke, and a trip engaging the holding means for disengaging the blade therefrom, said trip bcin'g'held out of engagement with the holding means by the article to be severed;

4. In mechanism of the character described, the combination with a cutting mem;

'ber movable from and to a set position, of

means for holding it in its set position, means for moving it from the set position when released from the holding means, means for returning it to its set position after its movement from the set position, an article controlled trip for releasing the cutting member from the holding device to per mit its movement from its set position, and means controlled by the movement of the cutting member from its set position to throw the returning means into operation.

In mechanism of the class described. the combination with a cutting member mov- 1 able to and from a set position, o't means for moving it from its set position, means for returning it to its set position, including an active driving member and a nornnilly inactive dri\cn member, and a controlling device for the latter mechanism operated by the cutting member on the movement of the cutting member from its set position to oper ate the normally inactive member from the active driving member.

6. In mechanism of the class described, the combination with a slid-able cuttingmember, of means for shifting it in one direction to make its cut. a device tor holding the member again t movement by said. means, automatic nicans for intermittently returning the cutting mcmbe after it has madeits cut into engagement with the holding device, and means controlled by the article to be cut for releasing said cutting member from the holding device to permit it to make its out.

7. In mechanism of the class described, the con'ibination with a movable cuttingmember, of a spring for moving the cutting mem her in one direction, a device for holding the member against movement by said spring, mechanism adapted to return the cutting member into engagement with its holding device against tie tension of said spring, a driving mechanism, means for en gaging the returning mechanism with said driving mechanism to actuate the returning mechanism when the cutting member has reached the end of its stroke, and means controlled by the article to be cut for releasing the cutting mechanism from the holding device and allowing it to be actuated by said spring to make its cut.

8. In mechanism of the class described, thecombination with a movable cutting member, of means tor moving it in one direction, a device forliolding the member against movement by said means, intermittently o 'ierated means for moving the cutting member into engagement with the holding device. means controlled hv the article to be cut for releasing the cutting member from the "holding device, and mechanism controlled by the movement of the cutting member for throwing the intermittently op- 'eratcd means into operation.

9. In mechanism of the class described, the combination with a cutting member movable to and from a set position, of a device for holding it in its set position, a spring for moving the cutting member from its set position, intermittently operated mechanism controlled by the movement of the cutting member from its set position to return it to said set position, and means controlled by the article to be cut for releasing a the cutting member from the holding device.

10. In a sewing machine, a thread severing member, means for operating the same including a spring, tripping device for holding said member away from the thread and a trip actuating'rod having means at one end for engagement with the fabric and. means at its opposite end for a limited play with respectto the tripping device.

11. In a sewing machine, a severing member, means for operating the same including a spring. a tripping device for controlling it movement, a spring'pressed rod having means at one end for engagement with the fabric, its opposite end being loosely connected to the tripping device.

12. In a sewin; machine, a severing member, means for operating the same, including a spring, a tripping device for controlling its operation, a spring pressed bar having means at one end for engagement with the fabric and connected at its opposite end to the tripping device, the connectlon being arranged to permit limited play of the bar to accommodate slight variations in thickness of the fabric without effecting the movement of the tripping device.

13. In a sewing machine, a thread severng member, means for operating the same including a spring, a tripping device normally holding the same away from the thread, a fabric controlled bar for-imparting movement to the tripping device and means operable on movement of the severing memher for temporarily disconnecting said bar from the tripping device.

' In a sewing machine, a severing member, means for operating the same, including a spring, a trip for holding the. same away from the thread, a trip leveiflfor engaging .said trip, a longitudinally movable bar having means at-one end for engagement with the fabric and operably connected at its opposite end to the trip lever and means operable on movement of the severing memher for disconnecting the bar from the lever.

15. In a sewing machine, a severing member, means for operating the same including a spring, a pivotally mounted trip for holding the same away from the thread, a trip lever arranged to engage said trip, a longitudinally movable bar having means at one end for engagement with the fabric and provided at its opposite end with a pin or lug, the end of the trip lever having a recess for the reception of said pin or lug.

16. In a sewing machine, the combination with a severing member, means for operating the same, including a spring, of a trip for holding the same away from the thread, a pivotally mounted trip lever having a recess" at oneend, a longitudinally movable bar having a guiding slot for the passage of the end of-the lever and provided with a pin that enters said recess and means at the opposite end of the bar for engagement with the fabric.

17. In a sewing machine, a severing mem ber, means for operating the same including a spring, a trip for holding the same away from the chain, a trip lever having a recessed end and provided with a projecting toe and a fabric actuated rod having a slot for thepassage of the end of the lever and its toe, said rod having a pm arranged to enter the recess of the lever.

longitudinally movable bar connected at one end to the trip lever and a fabric engaging disk at the opposite end of said-bar.

21. In a sewing machine, the combination with a chain severing member, means for operating the same includinga spring, of a trip for holding the same away from the thread, a trip lever arranged to engage the trip, a pivotally mounted frame adjacent to the head of the machine, a longitudinally movable bar mounted in said frame and arranged to engage the trip lever, a fabricengaging disk at the end of the bar, aspring tending to movd the frame in the direction of the severing meifber and interengaging cams carried by sai severing member and frame for temporarily disconnecting'the bar and trip lever.

22. In a sewing machine, a chain severing member, means for operating the same, including a spring, a trip for holding said member away from the thread, a trip actuating leverga pivotally mounted frame adjacent to the head of the machinefaspring actuated bar mounted in said frame and provided at one end with a fabric-engaging means interengaging cams carried by the severing member and frame and a connection between the bar and lever.

23. In a sewing machine, a longitudinally movable cutter bar and adjustable cam block carried thereby, a spring connecting the cam block to the fixed portion of the frame, a trip for holding the cutter bar away from the thread, a trip lever arranged to engage the trip, a pivotally mounted frame adjacent to the head of the machine, a longitudinally movable bar mounted in said frame and connected at one end to the trip lever, a cam carried by the frame and arranged to be engaged by the cam of the cutter bar and means at the lower end of the bar for engaging with the fabric.

24. In a sewing machine, a longitudinally movable cutter bar, a cam block adjustahly secured thereto, a sprin extending between the cam block and a fixed portion'of the frame, a pivoted trip engaging the cutter bar and holding the same from movement in the direction of the thread, a pivoted trip lever arranged to engage said .trip, a pivotally mounted frame, a spring pressed bar carried by said frame and provided at its lower end with a fabric engaging disk, opposite end of saidbar'having a slot head, a pin extending thrgmgh said slotted rec'ess for lthe 130 head, the trip lever ha '1'- the reception of the pin, a spring carried by the trip lever and bearing against the end wall of the slot, and tending to elevate the lever and a cam block carried by the pivoted frame and arranged to be engaged by the cutter bar cam.

25. In a sewing machine, a longitudinally movable cutter bar, a cam block adjustably secured thereto, a pivotally mounted trip for .havinga slotted head for the reception of the lever, a pin extending across the slot.

and arranged to engage the walls of the re-' cess of said lever and a cam carried by the pivoted frame and arranged to be engaged by the cutter bar cam.

26. In a sewing machine, a longitudinally movable cutter bar, a cam block adj ustably secured thereto, a spring extending between the cam block and a fixed portion of the frame, a trip for holding the cutter bar away from the thread, a pivotedtrip lever for actuating said trip, said lever having a recess at its free end, a pivotally mounted frame, a spring extending between said frame and the'trip tending to maintain both in operative positions, a longitudinally movable bar carried by said frame and provided at one end with a fabric engaging disk, the opposite end of said bar having a slotted head for the reception of a lever, a pin extending across the slot and arranged to enter the-recess, and a cam carried by the frame and arranged to beengaged by the cutter bar cam.

27. In a sewing machine,'a chain severing device, 'means for operating the same including a spring, an automatically operated trip normally holding the severing device from contact with the thread, means for operating said tri to release the severing device and means or automatically restoring the seven ing device to the initial position after each operation.

28. In a sewing machine, a thread severing member, a latch carried thereby, a trip for holding the severing member away from the thread, a fabric controlled means for actuating the trip and a continuously perated means for restoring the severing member into engagement with the trip after each movement.

29. In a sewing machine, an intermittently actuated severingmember, a trip for holding the same away from the thread, a latch carried by the severing member, a restoring lever for engaging said latch, and means for moving the latch to inoperative position aftereach restoring operation.

30. In a sewing machine, an.intermittently operating severing member, a trip for holding the same away from the thread, a latch carried by the severing member, a restoring lever for engaging the latch, means for moving said latch to inoperative position at the completion of each restoring operation, and means for moving the latch to engaging position for each-operative movement of the severing member.

31. In a sewing machine, a longitudinally movable cutter bar, a latch ivoted thereto and provided with a projecting lug, means arranged at the upper and lower limits of movement of the lug for shifting the position of the latch, a trip for holding the cut-- ter bar away from the chain, means forautomatically releasing the trip and a continuously vibrated lever for engaging the latch." Y

32. In a sewing machine, a longitudinally movable cutt'er bar, a latch pivoted thereto and provided with a projecting big, a fixed stop for engaging the lug at one limit of movement of the cutter bar and moving said latch to inoperativeposition, a spring for engaging the lug. at the opposite limit of movement and restoring the latch to operative position, a continuously vibratedlever for engaging said latch, a trip for holding the cutter bar away from the chain and a fabric controlled means for releasing the tri I n testimony whereof I afiix my signature, in presence of two witnesses.

DUDLEY S. SEYMOUR. \Yitnesses Crrssrnn M. NEIL, CHARLES JOHNSON. 

